-
Departments
- FB8
- Experimental
Physics - Group
Drees/Becks - Laboratory
for Detector Development - ATLAS
Pixel Detectors
| Test of VCSEL in a high magnetic field |
 |
A GEC package with MITEL VCSEL driven by a VDC was placed into a high magnetic field in order to proof if this system will work in the ATLAS 2T magnetic field.
The Birmingham 8T superconducting magnetic is rampable from 0T up to 8T. The GEC package was placed into a device in that way that different angle with respect to the B-field could be tested. Figure 1 depicts the principle of this set-up. Figure 2 and 3 show pictures of the experiment.
Figure 2: Photograph of the Birmingham 8T magnetic
Figure 2: Photograph of set-up for the experiment
The field was ramped up to two, four and six Tesla. At each value LI
curves of both VCSEL were taken at different angles. Figure 3 and 4 show
the LI curves. All measurements are the same within the error.
Figure 3: LI-curve of VCSEL1 at different magnetic fields and angles
Figure 4: LI-curve of VCSEL2 at different magnetic fields and angles
Beside this DC measurement also AC measurements were done. Figure 5
and figure 6 show hardcopies of the signal shape at 2 and 4 Tesla respectively.
The shape of the signals, rise time and fall time was not effected by the
field.
Figure 5: Hardcopy of a signal measured at 2 Tesla
Figure 6: Hardcopy of signal measured at 4 Tesla
Conclusions
There was no significant change in either the DC or AC behaviour of
the VCSEL in a magnetic field up to 6T.
last modified : 28 May 1999